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please answer below questions in one line each. No copying from internet

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1. List and briefly define three classes of intruders.

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2. What are two common techniques used to protect a password file?

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3. What are three benefits that can be provided by an intrusion detection system?

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4. What is the difference between statistical anomaly detection and rule-based intrusion detection?

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5. What metrics are useful for profile-based intrusion detection?

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6. What is the difference between rule-based anomaly detection and rule-based penetration identification?

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7. What is a honeypot?

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8. What is a salt in the context of UNIX password management?

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9. List and briefly define four techniques used to avoid guessable passwords.

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10. List three design goals for a firewall.

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11. List four techniques used by firewalls to control access and enforce a security policy.

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12. What information is used by a typical packet filtering firewall?

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13. What are some weaknesses of a packet filtering firewall?

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14. What is the difference between a packet filtering firewall and a stateful inspection firewall?

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15. What is an application-level gateway?

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16. What is a circuit-level gateway?

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17. What are the common characteristics of a bastion host?

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18. Why is it useful to have host-based firewalls?

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19. What is a DMZ network and what types of systems would you expect to find on such networks?

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20. What is the difference between an internal and an external firewall?

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